settings/d-bus: fix boolean return value of "LoadConnections"

The boolean value is intended to indicate success. It would indicated
failure due to a bug.

Fixes: 297d4985 ('core/dbus: rework D-Bus implementation to use lower layer GDBusConnection API'):
12 jobs for master in 32 minutes and 38 seconds (queued for 14 seconds)
Status Job ID Name Coverage
  Test
passed #292147
checkpatch

00:01:23

passed #292154
t_debian:9

00:17:11

passed #292156
t_debian:sid

00:16:59

manual #292155
allowed to fail manual
t_debian:testing
passed #292148
t_fedora:28

00:22:42

passed #292149
t_fedora:29

00:30:58

passed #292150
t_fedora:30

00:21:00

manual #292151
allowed to fail manual
t_fedora:rawhide
passed #292152
t_ubuntu:16.04

00:13:26

passed #292153
t_ubuntu:18.04

00:19:05

 
  Deploy
passed #292157
pages

00:00:22

passed pages:deploy

00:00:02